The Hitchhiker's Guide to the Galaxy offers this
definition of the word "infinite".

Infinite: Bigger than the biggest thing ever and then
some. Much bigger than that in fact, really amazingly
immense, a totally stunning size, real "wow, that's
big," time. Infinity is just so big that, by comparison,
bigness itself looks really titchy. Gigantic multiplied by
colossal multiplied by staggeringly huge is the sort of
concept we're trying to get across here.

2. Imports: None.

It is impossible to import things into an infinite
area, there being no outside to import things in from.

3. Exports: None.

See Imports

4. Population: None

It is known that there are an infinite number of
worlds, simply because there is an infinite amount of space
for them to be in. However, not every one of them is
inhabited. Therefore, there most be a finite number of
inhabited worlds. And finite number divided by infinity is as
near to nothing as makes no odds, so the average population
of all the planets in the Universe can be said to be zero.
From this it follows that the population of the whole
Universe is also zero, and that any person you may meet from
time to time are merely the products of a deranged
imagination.

5. Monetary Units: None

In fact there are three freely convertible currencies
in the Galaxy, but none of them count. The Altarian Dollar
has recently collapsed, the Flainian Pobble Bead is only
exchangeable for other Flainian Pobble Beads, and the
Triganic Pu has its own very special problems. It exchange
rate of eight Ningis to one Pu is simple enough, but since
Ningi is a triangular rubber coin six thousand eight hundred
miles along each side, no one has ever collected enough to
own one Pu. Nigis are not negotiable currency, because
Galactibanks refuse to deal in fiddling small change. From
this basic premise it is very simple to prove that the
Galactibanks are also the product of a deranged imagination.

6. Art: None

The Function of art is to hold the mirror up to nature,
and there simply isn't a mirror big enough- see point one.

7. Sex: None.

Well, in fact there is an awful lot in this, largely
because of the total lack of money, trade, banks, art or
anything else that might keep all the nonexistent people of
the Universe occupied.

However, it is not worth embarking on a long discussion
of it now because it really is terribly complicated. For
further information see Guide chapters seven, nine,
ten, eleven, fourteen, seventeen, nineteen, twenty-one to
eighty-four inclusive, and in fact most of the rest of the Guide